She had to summon all her courage to be seen like this, with a basketball tucked under her arm, as a veiled athlete at a forbidden place: at a gym.

Sara K. smiles weakly. She does not know how her father will react to the picture. He is quick to take a swipe at his children, she says. Sara, 20, was born in Berlin. Her father is from Algeria, her mother, a German, converted to Islam.

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